50EZ
Comfortr 13 SEER Single---Packaged Heat Pump
System with Puron® (R---410A) Refrigerant
Single and Three Phase
2 --- 5 Nominal Tons (Sizes 024---060)
Owner’s Information Manual
C99001
Fig. 1 - Unit 50EZ
NOTE TO EQUIPMENT OWNER:
For your convenience, please record the model and serial numbers of your new equipment in the spaces
provided. This information, along with the installation data and dealer contact information, will be helpful
should your system require maintenance or service.
UNIT INFORMATION
INSTALLATION INFORMATION
Model # _____________________________________
Serial # ______________________________________
Date Installed ________________________________
DEALERSHIP CONTACT INFORMATION
Company Name_______________________________
Address______________________________________
_____________________________________________
Phone Number _______________________________
Technician Name _____________________________
_____________________________________________
ACCESSORIES (List type and model #)
_____________________________________________
_____________________________________________
_____________________________________________
NOTE TO INSTALLER:
This manual must be left with the equipment owner.
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sorbed from the outside air. So, to maintain energy--efficient opera-
tion, your unit has an automatic defrost mode.
instance of filter grilles, the filters can simply be removed from the
grille and replaced.
The other typical application is an accessory filter rack installed in-
side the unit itself. The following information is given to assist in
changing filters used in these internal filter racks.
The defrost mode starts at a preset time interval of 60 minutes, al-
though, it may be reset to 30, 90 or 120 minutes. Defrost will start
at the preset time only if the ice is sufficient to interfere with normal
heating operation.
Table 1 indicates the correct indoor filter size for your unit. Refer
to Fig. 2 to access filters installed in the accessory filterrack. Ifusing
an Accessory Filter Rack, refer to the Installation Instructions pro-
vided with it for correct filter sizes and quantities.
After the ice is melted from the coil, or after a maximum of 10 min-
utes in defrost mode, the unit automatically switches back to normal
heating operation.
Table 1—Air Filters Located Inside Unit
(For Replacement Purposes)
Do not be alarmed if steam or fog appears at the outdoor unit during
defrost mode. Water vapor from the melting ice may condense into
a mist in the cold outside air.
Unit Size
50EZ024
Filter Size in. (mm)
20x20x1 (508x508x25)
20x24x1 (508x610x25)
24x30x1 (610x762x25)
24x36x1 (610x914x25)
During certain weather conditions such as heavy snow and freezing
rain it is not uncommon for ice to build up on the unit grille. This is
normal for these weather conditions. Do not attempt to remove the
ice from the unit grille. This condition will not affect the proper
function of the unit and will clear within a few days.
50EZ030
50EZ036---042
50EZ048---060
Emergency Heating Mode
To replace or inspect filters in accessory filter rack:
In the event of primary unit heat failure, the emergency heat mode
allows your supplemental heating source to keep your home or of-
fice warm until your unit can be serviced. Contact your dealer in the
event of primary unit heat failure.
1. Remove the filter access panel (See Fig. 2) using a 5/16--in.
nut driver.
2. Removethefilter(s)by pulling itoutoftheunit.If thefilter(s)
is dirty, clean or replace with a new one.
MAINTENANCE AND SERVICE
When installing the new filter(s), note thedirection ofthe airflow ar-
rows on the filter frame.
This section discusses maintenance that should be performed by
your dealer and care you, as the owner, may wish to handle for your
new unit.
If you have difficulty locating your air filter(s) or have questions
concerning proper filter maintenance, contact your dealer for in-
structions. When replacing filters, always use the same size and type
of filter that was supplied originally by the installer.
Routine Maintenance
All routine maintenance should be handled by skilled, experienced
personnel. Your dealer can help you establish a standard procedure.
To assure proper functioning of the unit, flow of condenser air must
not be obstructed from reaching the unit. Clearance from the top of
the unit is 48 in. (1219 mm). Clearance of at least 36 in. (914 mm)
is required on sides except the power entry side (42 in. clearance)
(1067 mm) and the duct side (12 in. minimum clearance) (305mm).
Maintenance and Care for the Equipment Owner
Before proceeding with those things you might want to maintain
yourself, please carefully consider the following:
!
WARNING
FIRE,EXPLOSION,ELECTRICAL SHOCKHAZARD
ACCESS PANEL
FILTER ACCESS
PANEL*
Failure to follow this warning could result in personal injury,
death or property damage.
*For accessory filter rack.
1. TURN OFF ELECTRICAL POWER TO YOUR UNIT
C99094
BEFORE
SERVICING
OR
PERFORMING
MAINTENANCE AND INSTALL A LOCK--OUT TAG.
Fig. 2 - Accessory Filter Rack Access Panel
(Optional Louvered Panels shown)
2. When removing access panels or performing maintenance
functions inside your unit, be aware of sharp sheet metal
parts and screws. Although special care is taken to reduce
sharp edges to a minimum, be extremely careful when
handling parts or reaching into the unit.
!
WARNING
FIRE AND UNIT OPERATION HAZARD
Failure to follow this warning could result in personal injury,
death or property damage.
Air Filters
The air filter(s) should be checked every 3 or 4 weeks and changed
or cleaned whenever it becomes dirty. Dirty filters produce exces-
sive stress on the blower motor and can cause the motor to overheat
and shut down.
Never operate your unit without filters in place. An
accumulation of dust and lint on internal parts of your unit can
cause loss of efficiency.
Fans and Fan Motor
This unit must have an air filter in place before it can be operated.
These filters should be located in at least one of two places. In many
applications, the installer will provide return air filter grilles
mounted on the wall or ceiling of the conditioned structure. In the
Periodically check the condition of fan wheels and housings and
fan--motorshaftbearings.Contactyourdealerforthe requiredannu-
al maintenance.
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Indoor and Outdoor Coils
trained service technician. An inspection (preferably each year, but
at least every other year) should include the following:
Cleaning of the coils should only be done by qualified service per-
sonnel. Contact your dealer for the required annual maintenance.
1. Inspection and, if required, cleaning of the outdoor and
indoor coils.
Condensate Drain
2. Inspection and, if required, cleaning of the indoor coil drain
pan.
The drain pan and condensate drain line should be checked and
cleaned at the same time the cooling coils are checked by your deal-
er.
3. Inspection and cleaning of blower wheelhousing andmotor.
Compressor
4. Inspection of all supply and return air ducts for leaks,
obstructions, and insulation integrity. Any problems found
should be resolved at this time.
All compressors arefactory shippedwith anormal chargeof thecor-
rect type and quantity of refrigeration grade oil. A compressor
should rarely require additional oil.
5. Inspectionof theunit baseto ensurethat nocracks, gaps,etc.,
exist which may cause a hazardous condition.
Condenser Fan
6. Inspection of the unit casing for signs of deterioration.
!
7. Inspection of all electrical wiring and components to assure
proper connection.
WARNING
PERSONAL INJURY AND UNIT DAMAGE HAZARD
8. Inspection for leaks in the refrigerant circuit. Pressure and
temperature check to determine appropriate refrigerant
charge.
Failure to follow this warning could result in personal injury,
death or property damage.
Do not poke sticks, screwdrivers, or any other object into
revolving fan blades.
9. Operational check of the unit to determine working
conditions.Repairoradjustmentshouldbe madeat thistime.
Your servicing dealer may offer an economical service contract that
covers seasonal inspections. Ask for further details.
The fan must be kept free of all obstructions to ensure proper cool-
ing. Contact your dealer for any required service.
Complete service instructions can be found in the unit Installation,
Start--up and Service Instructions.
Electrical Controls and Wiring
Electrical controlsare difficultto checkwithout properinstrumenta-
tion. If there are any discrepancies in the operating cycle, contact
your local dealer and request service.
Warranty Certificate
Your unit has a limited warranty. Be sure to read the warranty care-
fully to determine the coverage for your unit.
Refrigerant Circuit
Before you call for service...
Therefrigerantcircuitisdifficulttocheckforleakswithout theprop-
er equipment. If inadequate cooling is suspected, contact your local
dealer for service.
...check for several easily solved problems.
If insufficient heating or cooling is suspected:
( ) Check for sufficient airflow. Check the air filter for dirt. Check
forblockedreturnor supplyair grilles. Be surethey areopen and un-
obstructed. If these checks do not reveal the cause, call your servic-
ing dealer.
!
WARNING
EXPLOSION, BURN AND ENVIRONMENTAL
HAZARD
If your unit is not operating at all, check the following list for
easy solutions:
Failure to follow this warning could result in personal injury,
death or property damage.
( ) Check to be sure that your thermostat temperature selector is set
below the indoor temperature during the cooling season or above
theindoortemperatureduring heatingseason. Besure theSYSTEM
switch or MODE control is in the COOL or HEAT and not OFF.
System under pressure. Relieve pressure and recover all
refrigerant before system repair or final unit disposal. Use all
service ports and open all flow--control devices, including
solenoid valves.
(
) If your unit still fails to operate, call your servicing dealer for
Unit Panels
troubleshooting and repairs. Specify the model and serial numbers
of your unit. (Record them in this manual in the space provided.) If
the dealer knows exactly which unit you have, he may be able to of-
fer suggestions over the phone, or save valuable time through
knowledgeable preparation for the service call.
After performing any maintenance or service on the unit, be sure all
panels are fastened securely in place to prevent rain from entering
unit cabinet and to prevent disruption of the correct unit airflow pat-
tern.
Regular Dealer Maintenance
In Case of Trouble
In addition to the type of routine maintenance you might be willing
to perform, your unit should be inspected regularly by a properly
If you perform the steps above and unit performance is still unsatis-
factory, shut off the unit and call your dealer.
HEATING & COOLING
TO OBTAIN INFORMATION ON PARTS: Consult your installing dealer or classified section of your local telephone directory under the
“Heating Equipment” or “Air Conditioning Contractors & Systems” heading for dealer listing by brand name.
Have available the Model No., Series Letter, & Serial No. of your equipment to ensure correct replacement part.
Copyright 2008 Carrier Corporation
Printed in the U.S.A.
Edition Date: 02/08
Catalog No: OM50EZ---01
Manufacturer reserves the right to change, at any time, specifications and design without notice and without obligation.
Replaces: OM50---55
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